鄂尔多斯盆地西南缘中下侏罗统地层物源及构造演化对铀成矿的制约
俞礽安 , 李彤 , 杨桐旭 , 赵华雷 , 涂家润 , 胡永兴 , 唐永香
地球科学 ›› 2024, Vol. 49 ›› Issue (05) : 1793 -1809.
鄂尔多斯盆地西南缘中下侏罗统地层物源及构造演化对铀成矿的制约
Provenance and Tectonic Evolution of the Middle and Lower Jurassic Strata Constraints on the Uranium Mineralization in Southwest Margin of Ordos Basin
鄂尔多斯盆地西南缘位于阿拉善地块、秦岭造山带与祁连造山带3个构造单元的交汇部位,给含铀岩系地层的物源体系和铀成矿作用研究带来一定困难.通过选取泾川研究区的直罗组和延安组砂岩进行碎屑锆石U-Pb测年和微量元素研究,分析结果显示:泾川地区直罗组砂岩的碎屑锆石年龄呈215~767 Ma和 1 501~1 905 Ma;延安组砂岩的碎屑锆石年龄呈215~453 Ma、1 506~1 918 Ma和2 136~2 579 Ma.与源区同位素年代学对比认为直罗组和延安组砂岩的物源成分较为复杂,主要来自于阿拉善地块,其次来自于华北板块北缘和北祁连地区.从延安组到直罗组沉积期,祁连山和阿拉善陆块发生了快速隆升和剥蚀,为直罗组提供了物源,并且古生代和中生代侵入岩体提供物源的占比逐渐增大.研究西部靠近盆缘地区以中侏罗统砂岩层为找矿目的层,靠近盆内含矿层位逐渐变年轻.
鄂尔多斯盆地 / 泾川 / 中下侏罗统 / 碎屑锆石U-Pb年龄 / 物源 / 矿床 / 构造地质
Ordos basin / Jingchuan area / Middle and Lower Jurassic strata / U-Pb ages of detrital zircons / provenance / deposits / tectonics
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